How to remove ';security toolbar 7.1';?

My computer is infected with ''Security Toolbar 7.1'', and it is showing different symptoms:

1. Computer prompts me that my system is infected with different viruses like trojan-spy.win32@mx; and to download different antispam softwares.

2. I am having full updates of norton antivirus... but it is unable to detect this problem

3. I can not restore my computer in back date also...

4. There is no infrmation about this toolbar even in ''add or remove programme'' in control panel menu..

for information, i am having original windows XP home edition and a licenced copy of norton antivirus.

i dont want to spent any more to remove this ''Security toolbar 7.1''

Can anybody help me by telling the method to remove this spyware from my computer without spending money?

I have also tried with different free antyspam software like spyware doctor, HJTINSTALL.exe...but couldn't find effective solution.

Please specify me any manual removal tool..with effective links...if any.

How to remove ''security toolbar 7.1''?aurora

Here is a list of some free ANTI-SPYWARE programs.

Adaware is probably the most popular.

Adaware

http://www.lavasoftusa.com/software/adaw...

Microsoft Defender

http://www.microsoft.com/athome/security...

AVG

http://free.grisoft.com/doc/avg-anti-spy...